avi.c

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/*
 *
 * This is external code.
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>

#include "MEM_guardedalloc.h"
#include "MEM_sys_types.h"

#include "BLI_winstuff.h"

#include "AVI_avi.h"
#include "avi_intern.h"

#include "endian.h"

static int AVI_DEBUG=0;
static char DEBUG_FCC[4];

#define DEBUG_PRINT(x) if(AVI_DEBUG) printf("AVI DEBUG: " x);

/* local functions */
char *fcc_to_char (unsigned int fcc);
char *tcc_to_char (unsigned int tcc);



/* implemetation */

unsigned int GET_FCC (FILE *fp)
{
    unsigned char tmp[4];

    tmp[0] = getc(fp);
    tmp[1] = getc(fp);
    tmp[2] = getc(fp);
    tmp[3] = getc(fp);

    return FCC (tmp);
}

unsigned int GET_TCC (FILE *fp)
{
    char tmp[5];

    tmp[0] = getc(fp);
    tmp[1] = getc(fp);
    tmp[2] = 0;
    tmp[3] = 0;

    return FCC (tmp);
}

char *fcc_to_char (unsigned int fcc)
{
    DEBUG_FCC[0]= (fcc)&127;
    DEBUG_FCC[1]= (fcc>>8)&127;
    DEBUG_FCC[2]= (fcc>>16)&127;
    DEBUG_FCC[3]= (fcc>>24)&127;

    return DEBUG_FCC;   
}

char *tcc_to_char (unsigned int tcc)
{
    DEBUG_FCC[0]= (tcc)&127;
    DEBUG_FCC[1]= (tcc>>8)&127;
    DEBUG_FCC[2]= 0;
    DEBUG_FCC[3]= 0;

    return DEBUG_FCC;   
}

int AVI_get_stream (AviMovie *movie, int avist_type, int stream_num)
{
    int cur_stream;

    if (movie == NULL)
        return -AVI_ERROR_OPTION;

    for (cur_stream=0; cur_stream < movie->header->Streams; cur_stream++) {
        if (movie->streams[cur_stream].sh.Type == avist_type) {
            if (stream_num == 0)
                return cur_stream;
            else
                stream_num--;
        }
    }

    return -AVI_ERROR_FOUND;
}

static int fcc_get_stream (int fcc)
{
    char fccs[4];

    fccs[0] = fcc;
    fccs[1] = fcc>>8;
    fccs[2] = fcc>>16;
    fccs[3] = fcc>>24;

    return 10*(fccs[0]-'0') + (fccs[1]-'0');
}

static int fcc_is_data (int fcc)
{
    char fccs[4];

    fccs[0] = fcc;
    fccs[1] = fcc>>8;
    fccs[2] = fcc>>16;
    fccs[3] = fcc>>24;

    if (!isdigit (fccs[0]) || !isdigit (fccs[1]) || (fccs[2] != 'd' && fccs[2] != 'w'))
        return 0;
    if (fccs[3] != 'b' && fccs[3] != 'c')
        return 0;

    return 1;
}

AviError AVI_print_error (AviError in_error)
{
    int error;

    if ((int) in_error < 0)
        error = -in_error;
    else
        error = in_error;

    switch (error) {
    case AVI_ERROR_NONE:
        break;
    case AVI_ERROR_COMPRESSION:
        printf ("AVI ERROR: compressed in an unsupported format\n");
        break;
    case AVI_ERROR_OPEN:
        printf ("AVI ERROR: could not open file\n");
        break;
    case AVI_ERROR_READING:
        printf ("AVI ERROR: could not read from file\n");
        break;
    case AVI_ERROR_WRITING:
        printf ("AVI ERROR: could not write to file\n");
        break;
    case AVI_ERROR_FORMAT:
        printf ("AVI ERROR: file is in an illegal or unrecognized format\n");
        break;
    case AVI_ERROR_ALLOC:
        printf ("AVI ERROR: error encountered while allocating memory\n");
        break;
    case AVI_ERROR_OPTION:
        printf ("AVI ERROR: program made illegal request\n");
        break;
    case AVI_ERROR_FOUND:
        printf ("AVI ERROR: movie did not contain expected item\n");
        break;
    default: 
        break;
    }

    return in_error;
}
/*
void AVI_set_debug (int mode)
{
    AVI_DEBUG= mode;
}
*/
/*
int AVI_is_avi (char *name)
{
    FILE *fp;
    int ret;
    
    fp = fopen (name, "rb");
    if (fp == NULL)
        return 0;

    if (GET_FCC (fp) != FCC("RIFF") ||
        !GET_FCC (fp) ||
        GET_FCC (fp) != FCC("AVI ")) {
        ret = 0;
    } else {
        ret = 1;
    }

    fclose(fp);
    return ret;
}
*/

int AVI_is_avi (const char *name)
{
    int temp, fcca, j;
    AviMovie movie= {NULL};
    AviMainHeader header;
    AviBitmapInfoHeader bheader;
    int movie_tracks = 0;
    
    DEBUG_PRINT("opening movie\n");

    movie.type = AVI_MOVIE_READ;
    movie.fp = fopen (name, "rb");
    movie.offset_table = NULL;

    if (movie.fp == NULL)
        return 0;

    if (GET_FCC (movie.fp) != FCC("RIFF") ||
        !(movie.size = GET_FCC (movie.fp))) {
        fclose(movie.fp);
        return 0;
    }

    movie.header = &header;

    if (GET_FCC (movie.fp) != FCC("AVI ") ||
        GET_FCC (movie.fp) != FCC("LIST") ||
        !GET_FCC (movie.fp) ||
        GET_FCC (movie.fp) != FCC("hdrl") ||
        (movie.header->fcc = GET_FCC (movie.fp)) != FCC("avih") ||
        !(movie.header->size = GET_FCC (movie.fp))) {
        DEBUG_PRINT("bad initial header info\n");
        fclose(movie.fp);
        return 0;
    }
    
    movie.header->MicroSecPerFrame = GET_FCC(movie.fp);
    movie.header->MaxBytesPerSec = GET_FCC(movie.fp);
    movie.header->PaddingGranularity = GET_FCC(movie.fp);
    movie.header->Flags = GET_FCC(movie.fp);
    movie.header->TotalFrames = GET_FCC(movie.fp);
    movie.header->InitialFrames = GET_FCC(movie.fp);
    movie.header->Streams = GET_FCC(movie.fp);
    movie.header->SuggestedBufferSize = GET_FCC(movie.fp);
    movie.header->Width = GET_FCC(movie.fp);
    movie.header->Height = GET_FCC(movie.fp);
    movie.header->Reserved[0] = GET_FCC(movie.fp);
    movie.header->Reserved[1] = GET_FCC(movie.fp);
    movie.header->Reserved[2] = GET_FCC(movie.fp);
    movie.header->Reserved[3] = GET_FCC(movie.fp);

    fseek (movie.fp, movie.header->size-14*4, SEEK_CUR);

    if (movie.header->Streams < 1) {
        DEBUG_PRINT("streams less than 1\n");
        fclose(movie.fp);
        return 0;
    }
    
    movie.streams = (AviStreamRec *) MEM_callocN (sizeof(AviStreamRec) * movie.header->Streams, "moviestreams");

    for (temp=0; temp < movie.header->Streams; temp++) {

        if (GET_FCC(movie.fp) != FCC("LIST") ||
            !GET_FCC (movie.fp) ||
            GET_FCC (movie.fp) != FCC ("strl") ||
            (movie.streams[temp].sh.fcc = GET_FCC (movie.fp)) != FCC ("strh") ||
            !(movie.streams[temp].sh.size = GET_FCC (movie.fp))) {
            DEBUG_PRINT("bad stream header information\n");
            
            MEM_freeN(movie.streams);
            fclose(movie.fp);
            return 0;               
        }

        movie.streams[temp].sh.Type = GET_FCC (movie.fp);
        movie.streams[temp].sh.Handler = GET_FCC (movie.fp);

        fcca = movie.streams[temp].sh.Handler;
        
        if (movie.streams[temp].sh.Type == FCC("vids")) {
            if (fcca == FCC ("DIB ") ||
                fcca == FCC ("RGB ") ||
                fcca == FCC ("rgb ") ||
                fcca == FCC ("RAW ") ||
                fcca == 0) {
                movie.streams[temp].format = AVI_FORMAT_AVI_RGB;
            } else if (fcca == FCC ("mjpg")||fcca == FCC ("MJPG")) {
                movie.streams[temp].format = AVI_FORMAT_MJPEG;
            } else {
                MEM_freeN(movie.streams);
                fclose(movie.fp);
                return 0;
            }
            movie_tracks++;
        }
        
        movie.streams[temp].sh.Flags = GET_FCC (movie.fp);
        movie.streams[temp].sh.Priority = GET_TCC (movie.fp);
        movie.streams[temp].sh.Language = GET_TCC (movie.fp);
        movie.streams[temp].sh.InitialFrames = GET_FCC (movie.fp);
        movie.streams[temp].sh.Scale = GET_FCC (movie.fp);
        movie.streams[temp].sh.Rate = GET_FCC (movie.fp);
        movie.streams[temp].sh.Start = GET_FCC (movie.fp);
        movie.streams[temp].sh.Length = GET_FCC (movie.fp);
        movie.streams[temp].sh.SuggestedBufferSize = GET_FCC (movie.fp);
        movie.streams[temp].sh.Quality = GET_FCC (movie.fp);
        movie.streams[temp].sh.SampleSize = GET_FCC (movie.fp);
        movie.streams[temp].sh.left = GET_TCC (movie.fp);
        movie.streams[temp].sh.top = GET_TCC (movie.fp);
        movie.streams[temp].sh.right = GET_TCC (movie.fp);
        movie.streams[temp].sh.bottom = GET_TCC (movie.fp);

        fseek (movie.fp, movie.streams[temp].sh.size-14*4, SEEK_CUR);

        if (GET_FCC (movie.fp) != FCC("strf")) {
            DEBUG_PRINT("no stream format information\n");
            MEM_freeN(movie.streams);
            fclose(movie.fp);
            return 0;
        }

        movie.streams[temp].sf_size= GET_FCC(movie.fp);
        if (movie.streams[temp].sh.Type == FCC("vids")) {
            j = movie.streams[temp].sf_size - (sizeof(AviBitmapInfoHeader) - 8);
            if (j >= 0) {
                AviBitmapInfoHeader *bi;
                
                movie.streams[temp].sf= &bheader;
                bi= (AviBitmapInfoHeader *) movie.streams[temp].sf;
                
                bi->fcc= FCC("strf");
                bi->size= movie.streams[temp].sf_size;
                bi->Size= GET_FCC(movie.fp);
                bi->Width= GET_FCC(movie.fp);
                bi->Height= GET_FCC(movie.fp);
                bi->Planes= GET_TCC(movie.fp);
                bi->BitCount= GET_TCC(movie.fp);
                bi->Compression= GET_FCC(movie.fp);
                bi->SizeImage= GET_FCC(movie.fp);
                bi->XPelsPerMeter= GET_FCC(movie.fp);
                bi->YPelsPerMeter= GET_FCC(movie.fp);
                bi->ClrUsed= GET_FCC(movie.fp);
                bi->ClrImportant= GET_FCC(movie.fp);
                
                fcca = bi->Compression;

                if ( movie.streams[temp].format ==
                     AVI_FORMAT_AVI_RGB) {
                    if (fcca == FCC ("DIB ") ||
                        fcca == FCC ("RGB ") ||
                        fcca == FCC ("rgb ") ||
                        fcca == FCC ("RAW ") ||
                        fcca == 0 ) {
                    } else if ( fcca == FCC ("mjpg") || 
                        fcca == FCC ("MJPG")) {
                            movie.streams[temp].format = AVI_FORMAT_MJPEG;
                    } else {
                        MEM_freeN(movie.streams);
                        fclose(movie.fp);
                        return 0;
                    }
                }

            } 
            if (j > 0) fseek (movie.fp, j, SEEK_CUR);
        } else fseek (movie.fp, movie.streams[temp].sf_size, SEEK_CUR);

        /* Walk to the next LIST */     
        while (GET_FCC (movie.fp) != FCC("LIST")) {
            temp= GET_FCC (movie.fp);
            if (temp<0 || ftell(movie.fp) > movie.size) {
                DEBUG_PRINT("incorrect size in header or error in AVI\n");
                
                MEM_freeN(movie.streams);
                fclose(movie.fp);
                return 0;               
            }
            fseek(movie.fp, temp, SEEK_CUR);            
        }

        fseek(movie.fp, -4L, SEEK_CUR);
    }
    
    MEM_freeN(movie.streams);
    fclose(movie.fp);

    /* at least one video track is needed */
    return (movie_tracks != 0); 

}

AviError AVI_open_movie (const char *name, AviMovie *movie)
{
    int temp, fcca, size, j;
    
    DEBUG_PRINT("opening movie\n");

    memset(movie, 0, sizeof(AviMovie));

    movie->type = AVI_MOVIE_READ;
    movie->fp = fopen (name, "rb");
    movie->offset_table = NULL;

    if (movie->fp == NULL)
        return AVI_ERROR_OPEN;

    if (GET_FCC (movie->fp) != FCC("RIFF") ||
        !(movie->size = GET_FCC (movie->fp)))
        return AVI_ERROR_FORMAT;

    movie->header = (AviMainHeader *) MEM_mallocN (sizeof (AviMainHeader), "movieheader");

    if (GET_FCC (movie->fp) != FCC("AVI ") ||
        GET_FCC (movie->fp) != FCC("LIST") ||
        !GET_FCC (movie->fp) ||
        GET_FCC (movie->fp) != FCC("hdrl") ||
        (movie->header->fcc = GET_FCC (movie->fp)) != FCC("avih") ||
        !(movie->header->size = GET_FCC (movie->fp))) {
        DEBUG_PRINT("bad initial header info\n");
        return AVI_ERROR_FORMAT;
    }
    
    movie->header->MicroSecPerFrame = GET_FCC(movie->fp);
    movie->header->MaxBytesPerSec = GET_FCC(movie->fp);
    movie->header->PaddingGranularity = GET_FCC(movie->fp);
    movie->header->Flags = GET_FCC(movie->fp);
    movie->header->TotalFrames = GET_FCC(movie->fp);
    movie->header->InitialFrames = GET_FCC(movie->fp);
    movie->header->Streams = GET_FCC(movie->fp);
    movie->header->SuggestedBufferSize = GET_FCC(movie->fp);
    movie->header->Width = GET_FCC(movie->fp);
    movie->header->Height = GET_FCC(movie->fp);
    movie->header->Reserved[0] = GET_FCC(movie->fp);
    movie->header->Reserved[1] = GET_FCC(movie->fp);
    movie->header->Reserved[2] = GET_FCC(movie->fp);
    movie->header->Reserved[3] = GET_FCC(movie->fp);

    fseek (movie->fp, movie->header->size-14*4, SEEK_CUR);

    if (movie->header->Streams < 1) {
        DEBUG_PRINT("streams less than 1\n");
        return AVI_ERROR_FORMAT;
    }
    
    movie->streams = (AviStreamRec *) MEM_callocN (sizeof(AviStreamRec) * movie->header->Streams, "moviestreams");

    for (temp=0; temp < movie->header->Streams; temp++) {

        if (GET_FCC(movie->fp) != FCC("LIST") ||
            !GET_FCC (movie->fp) ||
            GET_FCC (movie->fp) != FCC ("strl") ||
            (movie->streams[temp].sh.fcc = GET_FCC (movie->fp)) != FCC ("strh") ||
            !(movie->streams[temp].sh.size = GET_FCC (movie->fp))) {
            DEBUG_PRINT("bad stream header information\n");
            return AVI_ERROR_FORMAT;                
        }

        movie->streams[temp].sh.Type = GET_FCC (movie->fp);
        movie->streams[temp].sh.Handler = GET_FCC (movie->fp);

        fcca = movie->streams[temp].sh.Handler;
        
        if (movie->streams[temp].sh.Type == FCC("vids")) {
            if (fcca == FCC ("DIB ") ||
                fcca == FCC ("RGB ") ||
                fcca == FCC ("rgb ") ||
                fcca == FCC ("RAW ") ||
                fcca == 0) {
                movie->streams[temp].format = AVI_FORMAT_AVI_RGB;
            } else if (fcca == FCC ("mjpg")||fcca == FCC ("MJPG")) {
                movie->streams[temp].format = AVI_FORMAT_MJPEG;
            } else {
                return AVI_ERROR_COMPRESSION;
            }
        }
        
        movie->streams[temp].sh.Flags = GET_FCC (movie->fp);
        movie->streams[temp].sh.Priority = GET_TCC (movie->fp);
        movie->streams[temp].sh.Language = GET_TCC (movie->fp);
        movie->streams[temp].sh.InitialFrames = GET_FCC (movie->fp);
        movie->streams[temp].sh.Scale = GET_FCC (movie->fp);
        movie->streams[temp].sh.Rate = GET_FCC (movie->fp);
        movie->streams[temp].sh.Start = GET_FCC (movie->fp);
        movie->streams[temp].sh.Length = GET_FCC (movie->fp);
        movie->streams[temp].sh.SuggestedBufferSize = GET_FCC (movie->fp);
        movie->streams[temp].sh.Quality = GET_FCC (movie->fp);
        movie->streams[temp].sh.SampleSize = GET_FCC (movie->fp);
        movie->streams[temp].sh.left = GET_TCC (movie->fp);
        movie->streams[temp].sh.top = GET_TCC (movie->fp);
        movie->streams[temp].sh.right = GET_TCC (movie->fp);
        movie->streams[temp].sh.bottom = GET_TCC (movie->fp);

        fseek (movie->fp, movie->streams[temp].sh.size-14*4, SEEK_CUR);

        if (GET_FCC (movie->fp) != FCC("strf")) {
            DEBUG_PRINT("no stream format information\n");
            return AVI_ERROR_FORMAT;
        }

        movie->streams[temp].sf_size= GET_FCC(movie->fp);
        if (movie->streams[temp].sh.Type == FCC("vids")) {
            j = movie->streams[temp].sf_size - (sizeof(AviBitmapInfoHeader) - 8);
            if (j >= 0) {
                AviBitmapInfoHeader *bi;
                
                movie->streams[temp].sf= MEM_mallocN(sizeof(AviBitmapInfoHeader), "streamformat");
                
                bi= (AviBitmapInfoHeader *) movie->streams[temp].sf;
                
                bi->fcc= FCC("strf");
                bi->size= movie->streams[temp].sf_size;
                bi->Size= GET_FCC(movie->fp);
                bi->Width= GET_FCC(movie->fp);
                bi->Height= GET_FCC(movie->fp);
                bi->Planes= GET_TCC(movie->fp);
                bi->BitCount= GET_TCC(movie->fp);
                bi->Compression= GET_FCC(movie->fp);
                bi->SizeImage= GET_FCC(movie->fp);
                bi->XPelsPerMeter= GET_FCC(movie->fp);
                bi->YPelsPerMeter= GET_FCC(movie->fp);
                bi->ClrUsed= GET_FCC(movie->fp);
                bi->ClrImportant= GET_FCC(movie->fp);
                
                fcca = bi->Compression;

                                if ( movie->streams[temp].format ==
                     AVI_FORMAT_AVI_RGB) {
                    if (fcca == FCC ("DIB ") ||
                        fcca == FCC ("RGB ") ||
                        fcca == FCC ("rgb ") ||
                        fcca == FCC ("RAW ") ||
                        fcca == 0 ) {
                    } else if ( fcca == FCC ("mjpg") || 
                        fcca == FCC ("MJPG")) {
                            movie->streams[temp].format = AVI_FORMAT_MJPEG;
                    } else {
                        return AVI_ERROR_COMPRESSION;
                    }
                }

            } 
            if (j > 0) fseek (movie->fp, j, SEEK_CUR);
        } else fseek (movie->fp, movie->streams[temp].sf_size, SEEK_CUR);
        
        /* Walk to the next LIST */     
        while (GET_FCC (movie->fp) != FCC("LIST")) {
            temp= GET_FCC (movie->fp);
            if (temp<0 || ftell(movie->fp) > movie->size) {
                DEBUG_PRINT("incorrect size in header or error in AVI\n");
                return AVI_ERROR_FORMAT;                
            }
            fseek(movie->fp, temp, SEEK_CUR);           
        }
        
        fseek(movie->fp, -4L, SEEK_CUR);        
    }

    while (1) {
        temp = GET_FCC (movie->fp);
        size = GET_FCC (movie->fp);

        if (size == 0)
            break;

        if (temp == FCC("LIST")) {
            if (GET_FCC(movie->fp) == FCC ("movi"))
                break;
            else
                fseek (movie->fp, size-4, SEEK_CUR);
        } else {
            fseek (movie->fp, size, SEEK_CUR);
        }
        if (ftell(movie->fp) > movie->size) {
            DEBUG_PRINT("incorrect size in header or error in AVI\n");
            return AVI_ERROR_FORMAT;
        }
    }

    movie->movi_offset = ftell (movie->fp);
    movie->read_offset = movie->movi_offset;
    
    /* Read in the index if the file has one, otherwise create one */
    if (movie->header->Flags & AVIF_HASINDEX) {
        fseek(movie->fp, size-4, SEEK_CUR);

        if (GET_FCC(movie->fp) != FCC("idx1")) {
            DEBUG_PRINT("bad index informatio\n");
            return AVI_ERROR_FORMAT;
        }

        movie->index_entries = GET_FCC (movie->fp)/sizeof(AviIndexEntry);
        if (movie->index_entries == 0) {
            DEBUG_PRINT("no index entries\n");
            return AVI_ERROR_FORMAT;
        }

        movie->entries = (AviIndexEntry *) MEM_mallocN (movie->index_entries * sizeof(AviIndexEntry),"movieentries");

        for (temp=0; temp < movie->index_entries; temp++) {
            movie->entries[temp].ChunkId = GET_FCC (movie->fp);
            movie->entries[temp].Flags = GET_FCC (movie->fp);
            movie->entries[temp].Offset = GET_FCC (movie->fp);
            movie->entries[temp].Size = GET_FCC (movie->fp);
            
            if (AVI_DEBUG) {
                printf("Index entry %04d: ChunkId:%s Flags:%d Offset:%d Size:%d\n",
                       temp, fcc_to_char(movie->entries[temp].ChunkId), movie->entries[temp].Flags,
                       movie->entries[temp].Offset, movie->entries[temp].Size);
            }
        }

/* Some AVI's have offset entries in absolute coordinates
 * instead of an offset from the movie beginning... this is...
 * wacky, but we need to handle it. The wacky offset always
 * starts at movi_offset it seems... so we'll check that.
 * Note the the offset needs an extra 4 bytes for some 
 * undetermined reason */
 
        if (movie->entries[0].Offset == movie->movi_offset)
            movie->read_offset= 4;
    }

    DEBUG_PRINT("movie succesfully opened\n");
    return AVI_ERROR_NONE;
}

void *AVI_read_frame (AviMovie *movie, AviFormat format, int frame, int stream)
{
    int cur_frame=-1, temp, i=0, rewind=1;
    void *buffer;

    /* Retrieve the record number of the desired frame in the index 
        If a chunk has Size 0 we need to rewind to previous frame */
    while(rewind && frame > -1) {
        i=0;
        cur_frame=-1;
        rewind = 0;

        while (cur_frame < frame && i < movie->index_entries) {
            if (fcc_is_data (movie->entries[i].ChunkId) &&
                fcc_get_stream (movie->entries[i].ChunkId) == stream) {
                if ((cur_frame == frame -1) && (movie->entries[i].Size == 0)) {
                    rewind = 1;
                    frame = frame -1;
                } else {
                    cur_frame++;
                }
            }
            i++;
        }
    }

    if (cur_frame != frame) return NULL;


    fseek (movie->fp, movie->read_offset + movie->entries[i-1].Offset, SEEK_SET);

    temp = GET_FCC(movie->fp);
    buffer = MEM_mallocN (temp,"readbuffer");

    if (fread (buffer, 1, temp, movie->fp) != temp) {
        MEM_freeN(buffer);

        return NULL;
    }
    
    buffer = avi_format_convert (movie, stream, buffer, movie->streams[stream].format, format, &temp);

    return buffer;
}

AviError AVI_close (AviMovie *movie)
{
    int i;

    fclose (movie->fp);

    for (i=0; i < movie->header->Streams; i++) {
        if (movie->streams[i].sf != NULL)
            MEM_freeN (movie->streams[i].sf);
    }

    if (movie->header != NULL)
        MEM_freeN (movie->header);
    if (movie->streams!= NULL)
        MEM_freeN (movie->streams);
    if (movie->entries != NULL)
        MEM_freeN (movie->entries);
    if (movie->offset_table != NULL)
        MEM_freeN (movie->offset_table);

    return AVI_ERROR_NONE;
}

AviError AVI_open_compress (char *name, AviMovie *movie, int streams, ...)
{
    va_list ap;
    AviList list;
    AviChunk chunk;
    int i;
    int64_t header_pos1, header_pos2;
    int64_t stream_pos1, stream_pos2;

    movie->type = AVI_MOVIE_WRITE;
    movie->fp = fopen (name, "wb");

    movie->index_entries = 0;

    if (movie->fp == NULL)
        return AVI_ERROR_OPEN;

    movie->offset_table = (int64_t *) MEM_mallocN ((1+streams*2) * sizeof (int64_t),"offsettable");
    
    for (i=0; i < 1 + streams*2; i++)
        movie->offset_table[i] = -1L;

    movie->entries = NULL;

    movie->header = (AviMainHeader *) MEM_mallocN (sizeof(AviMainHeader),"movieheader");

    movie->header->fcc = FCC("avih");
    movie->header->size = 56;
    movie->header->MicroSecPerFrame = 66667;
    movie->header->MaxBytesPerSec = 0;
    movie->header->PaddingGranularity = 0;
    movie->header->Flags = AVIF_HASINDEX | AVIF_MUSTUSEINDEX;
    movie->header->TotalFrames = 0;
    movie->header->InitialFrames = 0;
    movie->header->Streams = streams;
    movie->header->SuggestedBufferSize = 0;
    movie->header->Width = 0;
    movie->header->Height = 0;
    movie->header->Reserved[0] = 0;
    movie->header->Reserved[1] = 0;
    movie->header->Reserved[2] = 0;
    movie->header->Reserved[3] = 0;

    movie->streams = (AviStreamRec *) MEM_mallocN (sizeof(AviStreamRec) * movie->header->Streams,"moviestreams");

    va_start (ap, streams);

    for (i=0; i < movie->header->Streams; i++) {
        movie->streams[i].format = va_arg(ap, AviFormat);

        movie->streams[i].sh.fcc = FCC ("strh");
        movie->streams[i].sh.size = 56;
        movie->streams[i].sh.Type = avi_get_format_type (movie->streams[i].format);
        if (movie->streams[i].sh.Type == 0)
            return AVI_ERROR_FORMAT;

        movie->streams[i].sh.Handler = avi_get_format_fcc (movie->streams[i].format);
        if (movie->streams[i].sh.Handler == 0)
            return AVI_ERROR_FORMAT;

        movie->streams[i].sh.Flags = 0;
        movie->streams[i].sh.Priority = 0;
        movie->streams[i].sh.Language = 0;
        movie->streams[i].sh.InitialFrames = 0;
        movie->streams[i].sh.Scale = 66667;
        movie->streams[i].sh.Rate = 1000000;
        movie->streams[i].sh.Start = 0;
        movie->streams[i].sh.Length = 0;
        movie->streams[i].sh.SuggestedBufferSize = 0;
        movie->streams[i].sh.Quality = 10000;
        movie->streams[i].sh.SampleSize = 0;
        movie->streams[i].sh.left = 0;
        movie->streams[i].sh.top = 0;
        movie->streams[i].sh.right = 0;
        movie->streams[i].sh.bottom = 0;

        if (movie->streams[i].sh.Type == FCC("vids")) { 
/*
            if (movie->streams[i].format == AVI_FORMAT_MJPEG) {
                movie->streams[i].sf = MEM_mallocN (sizeof(AviBitmapInfoHeader) 
                                        + sizeof(AviMJPEGUnknown),"moviestreamformatL");
                movie->streams[i].sf_size = sizeof(AviBitmapInfoHeader) + sizeof(AviMJPEGUnknown);
            } else {
*/
            movie->streams[i].sf = MEM_mallocN (sizeof(AviBitmapInfoHeader),  "moviestreamformatS");
            movie->streams[i].sf_size = sizeof(AviBitmapInfoHeader);

            ((AviBitmapInfoHeader *) movie->streams[i].sf)->fcc = FCC ("strf");
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->size = movie->streams[i].sf_size - 8;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->Size = movie->streams[i].sf_size - 8;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->Width = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->Height = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->Planes = 1;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->BitCount = 24;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->Compression = avi_get_format_compression (movie->streams[i].format);
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->SizeImage = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->XPelsPerMeter = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->YPelsPerMeter = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->ClrUsed = 0;
            ((AviBitmapInfoHeader *) movie->streams[i].sf)->ClrImportant = 0;

/*
            if (movie->streams[i].format == AVI_FORMAT_MJPEG) {
                AviMJPEGUnknown *tmp;
                
                tmp = (AviMJPEGUnknown *) ((char*) movie->streams[i].sf +sizeof(AviBitmapInfoHeader));
                
                tmp->a = 44;
                tmp->b = 24;
                tmp->c = 0;
                tmp->d = 2;
                tmp->e = 8;
                tmp->f = 2;
                tmp->g = 1;
            }
        } else if (movie->streams[i].sh.Type == FCC("auds")) {
            ;
*/
        }
    }

    list.fcc = FCC("RIFF");
    list.size = 0;
    list.ids = FCC("AVI ");

    awrite (movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

    list.fcc = FCC("LIST");
    list.size = 0;
    list.ids = FCC("hdrl");

    awrite (movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

    header_pos1 = ftell(movie->fp);

    movie->offset_table[0] = ftell(movie->fp);

    awrite (movie, movie->header, 1, sizeof(AviMainHeader), movie->fp, AVI_MAINH);

    for (i=0; i < movie->header->Streams; i++) {
        list.fcc = FCC("LIST");
        list.size = 0;
        list.ids = FCC("strl");

        awrite (movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

        stream_pos1 = ftell(movie->fp);

        movie->offset_table[1+i*2] = ftell(movie->fp);
        awrite (movie, &movie->streams[i].sh, 1, sizeof(AviStreamHeader), movie->fp, AVI_STREAMH);

        movie->offset_table[1+i*2+1] = ftell(movie->fp);
        awrite (movie, movie->streams[i].sf, 1, movie->streams[i].sf_size, movie->fp, AVI_BITMAPH);

        stream_pos2 = ftell(movie->fp);

        fseek (movie->fp, stream_pos1-8, SEEK_SET);

        PUT_FCCN((stream_pos2-stream_pos1+4L), movie->fp);

        fseek (movie->fp, stream_pos2, SEEK_SET);
    }

    if (ftell(movie->fp) < 2024 - 8) {
        chunk.fcc = FCC("JUNK");
        chunk.size = 2024-8-ftell(movie->fp);

        awrite (movie, &chunk, 1, sizeof(AviChunk), movie->fp, AVI_CHUNK);

        for (i=0; i < chunk.size; i++)
            putc(0, movie->fp);
    }

    header_pos2 = ftell(movie->fp);

    list.fcc = FCC("LIST");
    list.size = 0;
    list.ids = FCC("movi");

    awrite (movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

    movie->movi_offset = ftell(movie->fp)-8L;

    fseek (movie->fp, AVI_HDRL_SOFF, SEEK_SET);

    PUT_FCCN((header_pos2-header_pos1+4L), movie->fp);

    return AVI_ERROR_NONE;
}

AviError AVI_write_frame (AviMovie *movie, int frame_num, ...)
{
    AviList list;
    AviChunk chunk;
    AviIndexEntry *temp;
    va_list ap;
    int stream;
    int64_t rec_off;
    AviFormat format;
    void *buffer;
    int size;

    if (frame_num < 0)
        return AVI_ERROR_OPTION;

    /* Allocate the new memory for the index entry */

    if (frame_num+1 > movie->index_entries) {
        temp = (AviIndexEntry *) MEM_mallocN ((frame_num+1) * 
            (movie->header->Streams+1) * sizeof(AviIndexEntry),"newidxentry");
        if (movie->entries != NULL) {
            memcpy (temp, movie->entries, movie->index_entries * (movie->header->Streams+1)
                * sizeof(AviIndexEntry));
            MEM_freeN (movie->entries);
        }

        movie->entries = temp;
        movie->index_entries = frame_num+1;
    }

    /* Slap a new record entry onto the end of the file */

    fseek (movie->fp, 0L, SEEK_END);

    list.fcc = FCC("LIST");
    list.size = 0;
    list.ids = FCC("rec ");

    awrite (movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

    rec_off = ftell (movie->fp)-8L;

    /* Write a frame for every stream */

    va_start (ap, frame_num);

    for (stream=0; stream < movie->header->Streams; stream++) {
        unsigned int tbuf=0;
        
        format = va_arg (ap, AviFormat);
        buffer = va_arg (ap, void*);
        size = va_arg (ap, int);

        /* Convert the buffer into the output format */
        buffer = avi_format_convert (movie, stream, buffer, format, movie->streams[stream].format, &size);

        /* Write the header info for this data chunk */

        fseek (movie->fp, 0L, SEEK_END);

        chunk.fcc = avi_get_data_id (format, stream);
        chunk.size = size;
        
        if (size%4) chunk.size += 4 - size%4;
        
        awrite (movie, &chunk, 1, sizeof(AviChunk), movie->fp, AVI_CHUNK);

        /* Write the index entry for this data chunk */

        movie->entries[frame_num * (movie->header->Streams+1) + stream + 1].ChunkId = chunk.fcc;
        movie->entries[frame_num * (movie->header->Streams+1) + stream + 1].Flags = AVIIF_KEYFRAME;
        movie->entries[frame_num * (movie->header->Streams+1) + stream + 1].Offset = ftell(movie->fp)-12L-movie->movi_offset;
        movie->entries[frame_num * (movie->header->Streams+1) + stream + 1].Size = chunk.size;

        /* Write the chunk */
        awrite (movie, buffer, 1, size, movie->fp, AVI_RAW);
        MEM_freeN (buffer);

        if (size%4) awrite (movie, &tbuf, 1, 4-size%4, movie->fp, AVI_RAW);

        /* Update the stream headers length field */
        movie->streams[stream].sh.Length++;
        fseek (movie->fp, movie->offset_table[1+stream*2], SEEK_SET);
        awrite (movie, &movie->streams[stream].sh, 1, sizeof(AviStreamHeader), movie->fp, AVI_STREAMH);
    }
    va_end (ap);

    /* Record the entry for the new record */

    fseek (movie->fp, 0L, SEEK_END);

    movie->entries[frame_num * (movie->header->Streams+1)].ChunkId = FCC("rec ");
    movie->entries[frame_num * (movie->header->Streams+1)].Flags = AVIIF_LIST;
    movie->entries[frame_num * (movie->header->Streams+1)].Offset = rec_off-8L-movie->movi_offset;
    movie->entries[frame_num * (movie->header->Streams+1)].Size = ftell(movie->fp)-(rec_off+4L);

    /* Update the record size */
    fseek (movie->fp, rec_off, SEEK_SET);
    PUT_FCCN (movie->entries[frame_num * (movie->header->Streams+1)].Size, movie->fp);

    /* Update the main header information in the file */
    movie->header->TotalFrames++;
    fseek (movie->fp, movie->offset_table[0], SEEK_SET);
    awrite (movie, movie->header, 1, sizeof(AviMainHeader), movie->fp, AVI_MAINH);

    return AVI_ERROR_NONE;
}

AviError AVI_close_compress (AviMovie *movie)
{
    int temp, movi_size, i;

    fseek (movie->fp, 0L, SEEK_END);
    movi_size = ftell (movie->fp);

    PUT_FCC ("idx1", movie->fp);
    PUT_FCCN ((movie->index_entries*(movie->header->Streams+1)*16), movie->fp);

    for (temp=0; temp < movie->index_entries*(movie->header->Streams+1); temp++)
        awrite (movie, &movie->entries[temp], 1, sizeof(AviIndexEntry), movie->fp, AVI_INDEXE);

    temp = ftell (movie->fp);

    fseek (movie->fp, AVI_RIFF_SOFF, SEEK_SET);

    PUT_FCCN((temp-8L), movie->fp);

    fseek (movie->fp, movie->movi_offset, SEEK_SET);

    PUT_FCCN((movi_size-(movie->movi_offset+4L)),movie->fp);

    fclose (movie->fp);

    for (i=0; i < movie->header->Streams; i++) {
        if (movie->streams[i].sf != NULL)
            MEM_freeN (movie->streams[i].sf);
    }
    if (movie->header != NULL)
        MEM_freeN (movie->header);
    if (movie->entries != NULL)
        MEM_freeN (movie->entries);
    if (movie->streams != NULL)
        MEM_freeN (movie->streams);
    if (movie->offset_table != NULL)
        MEM_freeN (movie->offset_table);
    return AVI_ERROR_NONE;
}